This disambiguation page lists articles associated with the title UPD. If an internal link led you here, you may wish to change the link to point directly to the intended article.
Chronic smokers often have difficulty breathing because they develop Chronic Obstructive Pulmonary Disorder, or COPD. The two diseases that fall under that category are emphys â¦ ema and chronic bronchitis.
Smoking causes: 1  Chronic obstructive pulmonary disease (COPD), a disease that gets worse over time and causes wheezing, shortness of breath, chest tightness, and other symptoms.  Emphysema, a condition in which the walls between the air sacs in your lungs lose their ability to stretch and shrink back.